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Talk:Counterexamples to Relativity (view source)
Revision as of 04:48, April 7, 2010
, 04:48, April 7, 2010→Reversion explained: Dark matter supposedly permeates the universe, and there's no way it would be flat if GR were true
:::::I still don't understand what you're saying. The ''overall'' visible universe ''is'' flat, at scales large enough that it can accurately be modeled as homogeneous and isotropic. (These scales are beyond the sizes of galactic clusters.) But on much smaller scales, where these assumptions obviously break down, matter does indeed curve spacetime; the phenomenon of gravitational lensing is precisely such an example. If you are at all confused by these different notions, I would recommend taking a look at a modern textbook on the subject; Barbara Ryden's ''Introduction to Cosmology'' is a good place to start. [[User:Yill|Yill]] 14:57, 6 April 2010 (EDT)
:::::I still don't understand what you're saying. The ''overall'' visible universe ''is'' flat, at scales large enough that it can accurately be modeled as homogeneous and isotropic. (These scales are beyond the sizes of galactic clusters.) But on much smaller scales, where these assumptions obviously break down, matter does indeed curve spacetime; the phenomenon of gravitational lensing is precisely such an example. If you are at all confused by these different notions, I would recommend taking a look at a modern textbook on the subject; Barbara Ryden's ''Introduction to Cosmology'' is a good place to start. [[User:Yill|Yill]] 14:57, 6 April 2010 (EDT)
::::::Dark matter supposedly permeates the universe, and there's no way it would be flat if GR were true.--[[User:Aschlafly|Andy Schlafly]] 00:48, 7 April 2010 (EDT)